/* Number
Boolean
String
Object
function
Symbol
bigInt
null
undefiend */
let a = 1
// console.log(typeof a);  //Number
a = 'hello'
// console.log(typeof a);  //String
a = true
// console.log(typeof a);  //boolean
a = null
// console.log(typeof a);  //object
a = undefined
// console.log(typeof a);  //undefined
a = Symbol(1)
// console.log(typeof a);  //symbol
a = 123n
// console.log(typeof a);  //bigint
a = []
// console.log(typeof a);  // object
a = {}
// console.log(typeof a);  //object
a = function () {}
// console.log(typeof a);  // function


